Gear-cutting machine.



No. 892,810. I PATENTED JULY '7, 1908 N. A. CHRISTENSEN.

GEAR CUTTING MACHINE.

APPLICATION FILED MAY 13.1901.

'3 SHEETS-SHEET 1 PATENHFED JULY 7, 1908.

N. A. CHRISTENSEN.

GEAR CUTTING MACHINE.

1. APPLMIATION FILED MAY 13 190 3 SHEBTS SHEBT 2.

.I .3 uh mm kw No. 892,810 PATENTED JULY 7, 1908.

N. A. CHRISTENSEN.

GEAR CUTTING MACHINE. APPLICATION FILED MAY13,1901.

3 SKEETB-SHEET 3.

k 72JU sibility of using a comparatively sh'ort cutter i line EF of Fig. 6; Fig. 8 an elevation of a invention willbe apparent from'the descrip- C -D of Fig. 2; Fig. 6 an enlarged elevation larged elevation of an adjusting collar, and

-and supported by the main frame 1, of a -usual main spindle 2.

,series of 'tap bolts 4 passing through trans- NIELS ANTON CHRISTENSEN, OF MILWAUKEE, WISCONSIN.

GE AIR-CUTTING MACHINE.

Specification of Letters Patent.

Patented July 7, 190B.

application filed May 13, 1901. Serial Nil- 59,966.

To all whom it 'lFta-y concern:

Be' it known that I, NinLs ANTON CHRIS- specification.

My invention relates to machines for outtinggears, more especially spiral gears, and consists in providing means whereby spiral gears may be cut in more effective and efficient manner. In the present instance such means comprises an attachment whereby the ordinary universal milling machine, for instance, may be adapted to the cutting of spiral gears, more effective work being rendered thereby" mainly by reason of the posarbor and of getting the work closer to the bearings of the machine.

Other novel features of advantage and utility resulting from the employment of my tion herein given.

In the drawings Figure 1 is an elevation of my attachment applied to a well known form of milling machine, certain of the parts of the attachment being shown in section; Fig. 2 a front elevation of my attachment and a portion of the machine frame; Fig. 3 an enlarged longitudinal section of a cutter arbor and its bearings; Fig. 4 a section on line A-B of Fig.2; Fig. 5 a section on line of the ring or collar 3; Fig. 7 a section on portion of the swinging frame; Fig. 9 an en- Fig. 10 an edge view of the tongue 35 and its screws 36.

My device or attachment is capable of application to any ordinary universal milling. machine, but it to be understood that my invention is not restricted in scope to any particular construction, orarrangement of machine to which it might be attached or in which it may be employed. My attachrfie nt orapparatus is herein shown as applie to milling machine in which is arranged the A ring or collar 3 is secured to the frame in any suitable manner, and as shown this ring is secured thereto by a verse holes 5 therein, three bolts being used in the present instance. This ring has an annular groove 6 communicating with a wider annular interior channel 7 both the groove and channel being described on the same radius as the bolt holes 5, which consequently pass through the bottom of the To rovide for the insertion of thechannel.v special form oi bolts 8, preferably used in my construction, the inner face of the ring or collar has an enlarged opening 9 communicatin, with the channel and of a size to permit t is head 10 of these special bolts to pass through.

A swinging frame 11 is provided with a series of holes 12, (four holes in the resent instance) to receive the .lour special olts 8 which are each passed through the back of the collar and rotated with the swinging frame after being inserted in the holes 1.2. Nuts 13 on these bolts serve to hold. the swinging frame in any position to which it may have been adjusted with reference to the fin br collar and machine generally. in this admstment or swinging oi the frame the heads 10 of the boltsmove in the interior channel of the ring or collar, the shanks of the bolts moving in the annular groove, and when the swinging frame and consequently the cutter (hereinafter described) are in the desired set position according to the angle to which the gears are to be out, such frame is clamped or secured in thatposition by screwing the nuts 1 3 tight against such swinging frame. The swinging frame has a stud 14 onwhich is mounted a gear 15 meshing with another gear 16 secured on the main spindle 2. Along with this gear 15 is a bevel or miter gear 17 which enga as with another .bevel gear 18 carrying a s eeve 19 provided with a pocket or socket suitable to receive the cutter arbor 20 whose cutter 21 is mounted on side of the arbor in the usual way. i I

A bearing 22 for the cutter arbor or rather for the socket piece or sleeve which receives such arbor is formed as an extension from the swinging frame and is preferably of the e, being clamped by the To provide a suitable bearing against the threads of such sleeve. adial placed holes areprovided in this collar for a spanner wrench. The cutter arbor is drawn up and surrounds one of the distance collars or sleeves 40 on the cutter arbor. A nut 41 is adjusted to screw on the end of the cutter arbor. 7

As is apparent from the above description the swinging frame is capable of swinging a complete circle around the main spindle and E the main gear and of being adjusted to any desired angle with relation to thework, which as shown consists of gear blanks 42. If it is now desired to cut a spiral gear with the teeth say 45 degrees angle the cutter arbor alread described is simply set at an angle of 45 egrees, right hand or left hand from the vertical line through the drivirig spindle, and the blank in which the teeth are to be out is then brought up against the cutter and fitted with the other universal spiral gear. The gears are thus cut down on the side instead of on the top as heretofore whereby the usual taper support is done away with as well as, the extra cutter arbor ,and long supporting arm. Furthermore my new arrangement permits of the table being placed at a right angle with the column whereby, I can get a longer mandrel of gear blanks in a machine of a given size than by the present method.

My. machine or attachment is useful in cutting spiral gears and more articularly in making herring bone gears un er my method in which a series of gear blanks 42 are ar ranged on a mandrel and spiral gears then cut thereon, of which the faces of two of such gears are reversed, accurately matched and then riveted together to form a herring bone gear.

1. In a gear-cutting machine, the combination of a machine frame,- a ring having a circular groove and an interior circular channel communicating therewith, a swinging frame carrying the cutter, bolts having heads movable inthe channel and passing through said groove and into said swinging frame, and fastening bolts having heads engaged in said channel and entering the machine frame.

- 2. In a gear-cutting machine, the combination of a machine frame, a ring or collar secured thereto and having a circular groove and an interior circular channel communicating therewith, a swinging frame carrying the cutter, bolts having heads movable in the channel and passing through said groove and into said swinging frame, said channel being counterbored at intervals for fastenin bolts and having an opening from the rear for the introduction of the first named bolts, and fastening bolts having heads engaged in the counter bores of the channel and entering the machine frame. 1

3. The combination with a machine frame, of a swinging frame thereon, having a recess 33at its lower end, bearings 24 and 32 thereon, a cutter arbor supported by such bearings, means for rotating the arbor, the bearing 32 being split, and having a recess 34 corresponding to recess 33, a tongue 35 received by said recesses and bolts 38 securing the bearing 32 to the swinging frame.

4. The combination with a machine frame of a swinging frame thereon having end slots 37, bearings 24 and 32 thereon, a cutter arbor supported by such bearings, means for rotating the arbor, and bolts 38 passing through said slots and fastening the bearing 32 to the swinging frame.

5. In a gear cutting machine, the combi nation with' a machine frame, of'a swinging frame rotatably mounted thereon, two journals on said'sWinging frame sup orting an arbor, and a cutter carried OIl-Sfil arbor intermediate of said journals, one of the journals having a slotted connection with said swinging frame, whereby it may be slipped from the end of the arbor to permit the insertion and removal of said cutter.

N IELS ANTON CHRISTENSEN.

Witnesses:

S. E. HIBBEN,' LoUIs B. ERWIN. 

